Exception during XML rendering

Exception raised during rendering: Index: 0, Size: 0

Exception details are logged in Window > Show View > Error Log

I don't know how to see the Error Log, couldn't find it. I'm sure that the error is in that Spinner:

<Spinner
    android:id="@+id/spinnerRacaAnimaisAddEdit"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="15dp"
    android:background="@drawable/selector_slim_spinner"
    android:prompt="@string/escolher_raca_prompt"
    android:spinnerMode="dialog" />

I'm using API 11 min and 19 max and the background of the spinner is a .9, I put the .9 files in all the drawable folders with the respectives sizes. I used a website to convert the size of the .9. I don't know what is wrong.